JPS6320210A - Stabilizer device - Google Patents

Abstract

PURPOSE:To improve reliability for restraining a rolling motion by coupling a piston having a communication hole to a cylinder fixed to one end of the fitting part of a spring lower member and a stabilizer bar, and opening the communication hole when said piston is at a predetermined position. CONSTITUTION:When a shutoff valve 48 has been operated to shut off a hydraulic circuit 47, a plate member 41 is elastically deformed due to the energized forces of springs 45 and 46 and the communication hole of a piston 38 opens, provided that the piston 38 is located off a predetermined position. In other words, the piston 38 stops after sliding to the neighborhood of the predetermined position and turns into a fixed position. Therefore, the fitting part of a stabilizer bar 2 and a lower arm 4 are fixed at an established neutral interval. According to the aforesaid constitution, a stability power can be supplied to equalize the suspension positions of both right and left wheels in turning, thereby improving the reliability of restraining a rolling motion.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION [Field of Industrial Application] The present invention relates to a stabilization device that is effective in suppressing rolling of a vehicle when turning while driving on a rough road.

[Prior Art] When a vehicle turns, rolling occurs due to the action of centrifugal force. In this case, as the roll angle increases, the camber angle also changes, resulting in an increase in canvas thrust and a decrease in maneuverability and stability. Therefore, in order to maintain the turning state, it is necessary to perform corrective steering frequently. In order to suppress such rolling and improve maneuverability and stability, it is conceivable to set the spring constant of the suspension high, for example. However, in this case, impactful vibrations, such as when driving on rough roads, are not absorbed, and ride comfort deteriorates. Therefore, a vehicle is provided with a stabilizer that acts as a spring and generates a restoring force only when the suspension positions of the left and right wheels are different, in order to suppress rolling.

However, even if the vehicle is not rolling, for example, if one of the left and right wheels rides on a bump on the road surface, there will be a difference in the suspension position of the left and right wheels, so the stabilizer will generate torsional elastic force and act as a spring. It works. For this reason, the ride comfort deteriorates in the same way as when the suspension's spring constant is set high. As a countermeasure against such defects, for example, a ``vehicle stabilizer mounting device'' (Japanese Patent Application Laid-open No. 131024/1983) has been proposed. That is, a hydraulic piston having a predetermined stroke is interposed between the arm that holds the left and right wheels and the attachment part at one end of the stabilizer, and when the vehicle is normally traveling straight, the hydraulic piston is in a movable state and the stabilizer is not activated. This technology detects centrifugal force to keep the hydraulic piston in a fixed state and act as a stabilizer only when turning.

[Problems to be Solved by the Invention] By the way, when fixing a movable hydraulic piston during rotation, the position at which the hydraulic piston is fixed is extremely important. In other words, it is necessary to fix the hydraulic piston at a so-called neutral position where a neutral distance, which is the distance between the unsprung member and the mounting part of the stabilizer bar, can be achieved when the wheels are in the suspension position in the standard state of the vehicle. be. However, if consideration is not given to the fixing position of the hydraulic piston, when turning while driving on rough roads, the suspension positions of the left and right wheels may differ greatly due to riding over uneven road surfaces, etc. In such cases, the hydraulic piston There may also be cases where the value is set to a fixed state. In such a case, when the suspension positions of the left and right wheels become equal, the stabilizer generates a torsional elastic force, so there is a problem that the stabilizer acts to increase the rolling of the vehicle.

An object of the present invention is to provide a stabilizer device that can operate the stabilizer in a fixed state at a position where an appropriate restoring force can be obtained even when turning while driving on a rough road.

[Means for Solving the Problems] The present invention, which has been made to solve the above problems, has the following features: In a stabilizer device equipped with a connecting unit.

The connection unit is fixed to either the unsprung member or the mounting part of the stabilizer bar, and is fixed to a cylinder filled with liquid inside, and to the unsprung member or the mounting part of the stabilizer bar. a piston that supports a piston rod, is slidably fitted into the cylinder, and has a communication hole that communicates with the cylinder in the sliding direction; and a valve that contacts both end surfaces of the piston and closes the communication hole. and a lower chamber of the cylinder divided by the piston, and when the piston is located near a predetermined position in the cylinder, an elastic member that closely opposes the valve member; a hydraulic circuit that connects an upper chamber and a lower chamber of the cylinder outside the cylinder; and a shutoff valve that opens and closes the hydraulic circuit; When the hydraulic circuit is shut off, when the piston is located at a position away from the predetermined position in the cylinder, the valve member is elastically deformed by receiving a pressing force from the elastic member, thereby causing the screw 1 to communicate. The object of the present invention is to provide a stabilizer device characterized in that it is configured such that a hole is opened.

Here, the valve member can be realized by, for example, a plate member.

Further, the elastic member may be, for example, a coil spring. Further, for example, it may be molded from rubber, urethane, or the like.

[Operation] In the stabilizer device of the present invention, when the hydraulic circuit is cut off by the cutoff valve, when the piston is located at a position away from a predetermined position in the cylinder, the valve member becomes elastic due to the biasing force of the elastic member. It deforms and works to open the communication hole of the piston.

That is, if the hydraulic circuit is cut off while the piston is away from a predetermined position in the cylinder, the piston slides to the vicinity of the predetermined position and then stops and becomes fixed.

Therefore, when the stabilizer device of the present invention turns, for example, it moves so as to fix the unsprung member and the handle part of the stabilizer bar at a so-called neutral position where the distance between them is a neutral distance. The technical problems of the present invention are solved by each component of the present invention acting as described above.

[Embodiment] Next, a preferred embodiment of the present invention will be described in detail based on the drawings. FIG. 2 shows the overall configuration of a stabilizer device that is an embodiment of the present invention.

The stabilizer device 1 is a connecting unit 5 interposed between the outer claw (=J part) of the stabilizer bar 2 of the front wheel 1 and the lower arm 4 of the left front wheel 3.The left attachment part of the rear stabilizer bar 6 and the left rear A connection unit 9, a vehicle speed sensor 10, a steering angle sensor 11, a vehicle width direction acceleration sensor 12, and an electronic control unit (hereinafter simply referred to as ECU 7S) that controls these are interposed between the lower arm 8 of the wheel 7. 20
It consists of Note that there is a stabilizer link 15 between the right attachment part of the front stabilizer bar 2 and the lower arm 14 of the front right wheel 13, and between the right attachment part of the rear stabilizer bar 6 and the lower arm 17 of the right rear wheel 16. are connected to each other by stabilizer links 18.

Since the configurations of the connecting units 5 and 9 are similar, the connecting unit 5 will be explained based on FIG. 1 as an example. As shown in FIG. 1, the connection unit 5 is fixed to the lower arm 4, and includes a cylinder 33 whose both ends are oil-tightly sealed by seal members 31 and 32 and filled with hydraulic oil, and a stabilizer bar 2. A piston 38 that supports a piston rod 35 connected to a mounting portion via a bushing 34, slidably fits into the cylinder 33, and has communication holes 36 and 37 communicating in the circumferential direction; Spring 39 disposed on the outer peripheral edge of the upper and lower surfaces of 38.
The cylinder 33 is divided by plate members 41 and 42, which are valve members, which come into contact with both end surfaces of the piston 38 and close the communication holes 36 and 37 by the urging force of the cylinder 38. When the piston 38 is located near a predetermined neutral position in the cylinder 33, the plate members 41.4 on both end faces of the piston 38 -2 as an elastic member fixed to the sealing member 31.32 so as to be close to and opposite to -2. lI6, a hydraulic circuit 4 connecting the lower chamber 43 and lower chamber 41 of the cylinder 33;
7. Consists of a shutoff valve 4B that opens and closes the hydraulic circuit 47. Here, - the connection unit 5 is positioned so that when the screw 1 hem 38 is located near the neutral position inside the cylinder 33, the distance between the mounting portion of the stabilizer bar 2 and the lower arm 4 is a neutral distance. It is installed and connected. Here, the neutral distance is the distance between the unsprung member and the mounting portion of the stabilizer bar when the left and right wheels are in the suspension position in the standard state of the vehicle.

The connection unit 5 includes an ECU 20 including a CPU, ROM, RAM, etc., and a vehicle speed sensor 10. Based on the detection signals of the steering angle sensor 11 and the vehicle width direction acceleration sensor 12, a control signal for energizing or de-energizing is outputted to the cutoff valve 4B, which is a two-bottom, two-position solenoid valve, according to a built-in program. It works as follows.

That is, in the case of non-excitation, such as when driving straight, the shutoff valve 4
8 is in the position shown in FIG. For this reason, the cylinder 33
The upper chamber 43 and the lower chamber 44 are in communication, and hydraulic oil can flow in both directions between the two chambers 43 and 44 through the hydraulic circuit 47. Therefore, the piston 38 is slidable in the six directions of arrows and in the direction of arrow B in the figure, and the distance between the mounting portion of the stabilizer bar 2 and the lower arm 4 is variable. Therefore, the stabilizer bar 2 is in a state where it does not supply torsional elastic force to the lower arm 4, and does not function as a stabilizer.

On the other hand, when a transition to a turning state is predicted based on the detection results of the vehicle speed sensor 10 and the steering angle sensor 11, EC1J2
0 energizes the isolation valve 48, which switches to the right position shown in FIG. Therefore, the upper chamber 43 and the lower chamber 44 of the cylinder 33 are in a disconnected state, and the hydraulic oil cannot flow through the hydraulic circuit 47. Here, as shown in FIG. 1, if the piston 38 is in the vicinity of the neutral position within the cylinder 33 and neither of the plate members 41, 42 is in contact with the coil spring 45, 46, the plate member 41 and 42 both close the communication holes 36 and 37. Therefore, the piston 38 becomes unable to slide and stops, and the distance between the mounting portion of the stabilizer bar 2 and the lower arm 4 is fixed at the neutral distance described above. As a result, the stabilizer bar 2 is in a state where it supplies torsional elastic force to the lower arm 4) and acts as a stabilizer.

On the other hand, if the shutoff valve 48 shuts off the hydraulic circuit/17 when the piston 38 is at a position away from the neutral position toward the upper chamber 43, as shown in FIG. 3 (A>), the operation will be as follows. That is, the plate member 41 is elastically deformed by the bias of the coil spring 45, and as shown in FIG. The piston 38 separates from the end surface of the piston 38 against the bias of the piston 38. As a result, the communication hole 36 opens, and the hydraulic oil flows from the lower chamber 44 through the communication hole 36 into the upper chamber 43 as shown by arrow U. At this time, the piston 38 is receiving a pressing force from the coil spring 45 in the direction of arrow B from the upper chamber 43 to the lower chamber 44. Therefore, the piston 38 is pushed into the cylinder 33 until near the neutral position.
Slide inside in the direction of arrow B. Eventually, the piston 38
When the plate member 41 reaches near the neutral position, the coil spring 4
5, the plate member 41 closes the communication hole 36 due to the bias of the spring 39. Therefore, similarly to the case where the shutoff valve 48 shuts off the hydraulic circuit 47 in FIG. 1 described above, the piston 38 becomes unable to slide near the neutral position and stops.

Further, as shown in FIG. 3(B), when the piston 38 is in a position away from the neutral position toward the lower chamber 44 side, if the shutoff valve 48 shuts off the hydraulic circuit 47, the coil spring 46 Due to the biasing force, the plate member 42 is elastically deformed, and its center portion is pushed into the annular groove 33b of the piston 38, and its outer peripheral portion is separated from the end surface of the piston 38, opening the communication hole 37. As a result, the hydraulic oil flows from the upper chamber 43 to the lower chamber 44 through the communication hole 37 as shown by arrow V. Therefore, the piston 38, which is receiving a pressing force from the coil spring 46 in the six directions of the arrows from the lower chamber 44 to the upper chamber 43, slides inside the cylinder 33 in the six directions of the arrows, and moves to the vicinity of the neutral position as in the case described above. When it reaches , it becomes unable to slide and stops. In this way, Figure 3 (A), (
Even when the piston 3B is located at a position far from the neutral position as shown in B), when the hydraulic circuit 47 is shut off by energizing the shutoff valve 48, the piston 38 moves to near the neutral position and then stops. Therefore, stabilizer bar 2
The distance between the mounting portion and the lower arm 4 is fixed at the neutral distance described above. Thereby, the stabilizer bar 2 is in a state where it can supply torsional elastic force to the lower arm 4, and acts as a stabilizer.

According to this embodiment having the above configuration, when the cutoff valve is energized in anticipation of the transition of the vehicle to cornering, the piston 38 is always moved to a predetermined position within the cylinder 33, regardless of the position of the piston 38 at the time of energization. It stops near the neutral position. In this way, the stabilizer 1 aver 2 and the lower arm 4 can be fixed so as to form a neutral interval corresponding to a predetermined neutral position. Therefore, the stabilizer
Since a torsional elastic force that causes a difference in the suspension positions of the left and right wheels is not generated, and a restoring force that equalizes the suspension positions of the left and right wheels is supplied, unnecessary posture changes can be eliminated. This improves the reliability of suppressing rolling due to the action of the stabilizer. This is particularly effective in suppressing rolling when turning while driving on a rough road.

In addition, when the transition to turning travel is detected, the shutoff valve 4B
By simply energizing the stabilizer bar 2 and the lower arm 4, the stabilizer bar 2 and the lower arm 4 can be fixed at a neutral interval corresponding to a predetermined neutral position.
The configuration of U20 and the stabilizer control processing executed by the FCtJ20 can be simplified.

Furthermore, when the shutoff valve 48 is de-energized and the piston 38 is in a movable state, such as when traveling straight, the coil spring 45.
46 acts as a buffer against the sliding piston 38.

Therefore, even if either the left or right wheel receives an impact due to unevenness of the road surface, the impact will be absorbed by the coil spring 45.46.
is absorbed by the vehicle and is not transmitted to the other wheel. For this reason, the ride comfort while traveling straight is improved.

Although the springs 45 and 46 were used in this embodiment, for example, as shown in FIG. play.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments in any way, and it goes without saying that it can be implemented in various forms without departing from the gist of the present invention. be.

Effects of the Invention As detailed above, the stabilizer device of the present invention uses a cutoff valve to shut off the hydraulic circuit of the connection unit interposed between at least one of the unsprung members of the left and right wheels and the mounting portion of the stabilizer bar. Then, the piston is configured to stop near a predetermined position within the cylinder and enter a fixed state. For this reason, the unsprung member and the stabilizer bar mounting portion are fixed at an interval corresponding to a predetermined neutral position, so even when turning while driving on a rough road, the difference in suspension position between the left and right wheels can be avoided. In response to the increase, the stabilizer generates a torsional elastic force and applies a restoring force to equalize the suspension positions of the left and right wheels.

Therefore, the excellent effect of improving the reliability of suppressing rolling by the stabilizer is achieved without causing the problem of increasing the rolling of the vehicle due to a difference in vehicle height between the left and right wheels when turning.

In addition, the stabilizer device can be always fixed at a predetermined neutral position simply by closing the shutoff valve, making control of the stabilizer device extremely easy.

Furthermore, when the connecting unit is in a movable state, the elastic member acts as a buffer against one movement of the piston, so even if an impact occurs on either the left or right wheel, the impact will be absorbed by the connecting unit. Since it is not transmitted to the other wheel,
Ride comfort when driving straight is also improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a connection unit of a stabilizer device according to an embodiment of the present invention, FIG. 2 is an overall configuration diagram of the stabilizer device, and FIG. 3 (△). (B) is an explanatory diagram of the operation of the connecting unit, and FIG. 4 is an explanatory diagram showing the connecting unit in the second embodiment. 1... Stabilizer device 2.6... Stabilizer bar 4.8... Lower arm 5.9... Connection unit 33... Cylinder 35... Piston rond 36.37... Communication hole 38... ... Piston 41.42 ... Plate member 43 ... Upper chamber 44 ... Lower chamber 45.46 ... Coil spring 47 ... Hydraulic circuit 48 ... Shutoff valve 55.56 ... Elasticity Element

Claims (1)

[Scope of Claims] 1. A stabilizer device in which a connection unit is interposed between at least one of each unsprung member of the left and right wheels of a vehicle and a mounting portion of a stabilizer bar, wherein the connection unit is connected to the unsprung member or the above-mentioned unsprung member. A cylinder fixed to one of the mounting parts of the stabilizer bar and filled with liquid, and a piston rod fixed to the other of the unsprung member or the mounting part of the stabilizer bar are supported and slide with the cylinder. a piston having a communication hole that freely fits and communicates in the sliding direction; a valve member that abuts both end surfaces of the piston to close the communication hole; and a cylinder that is divided by the piston. an elastic member disposed in each of the upper chamber and the lower chamber, which approaches and opposes the valve member on both end surfaces of the piston when the piston is located near a predetermined position within the cylinder; a hydraulic circuit that connects an upper chamber and a lower chamber outside the cylinder; and a cutoff valve that opens and closes the hydraulic circuit; and further, when the cutoff valve shuts off the hydraulic circuit, the piston moves into the cylinder. The stabilizer device is characterized in that when the valve member is at a position away from the predetermined position within the piston, the valve member is elastically deformed by receiving a pressing force from the elastic member to open the communication hole of the piston.